ABSTRACT. Different treatment outcomes and prognoses in patients with breast cancer can be observed with similar clinical predictors; this is because the biology of breast cancer is complex and heterogenous, involving multiple unknown contributing factors. We looked for plasma human mammaglobin (hMAM) mRNA by RT-PCR in 82 Korean patients with breast cancer to determine if there is an association Plasma mammaglobin mRNA and prognostic factors between the presence of plasma hMAM mRNA in these patients and known prognostic factors. The prognostic usefulness of detection of plasma hMAM mRNA expression in these patients was also evaluated by determining overall survival and event-free survival. A significant difference was observed in the rate of positivity of plasma hMAM mRNA between the early stages of cancer (stages I-II, 23.4%) and advanced stages (stages III-IV, 82.9%). The expression rates of estrogen receptor, progesterone receptor, and HER-2/neu in the breast tissue of these patients, by immunohistochemistry, were 69.5, 75.6, and 20.7%, respectively. In the univariate analysis, plasma hMAM expression was significantly correlated with high histological and nuclear grades, nodal metastasis, and negative estrogen receptor and progesterone receptor status. Patients negative for plasma hMAM mRNA had significantly higher rates of event-free survival compared to the patients positive for plasma hMAM mRNA. However, no significant association with overall survival was observed for expression of plasma hMAM mRNA (P = 0.16). Qualitative detection of plasma hMAM mRNA appears to be associated with unfavorable prognostic factors and lower rates of event-free survival in patients with breast cancer.
It is well known that very early development of the mammalian pre-implantation embryo is regulated by gene transcripts and proteins stored in the oocyte and that the embryonic genome gains control of development following 1 to 3 cleavage divisions. An active transcription and translation is required for chromatin condensation and germinal vesicle breakdown in pig oocyte. The transition from maternal to embryonic control of development is a gradual event, and following this transition, the maternally derived transcripts and proteins are gradually degraded. Successful embryonic development is dependent on the temporal and stage-specific expression of proper genes, but information on specific gene expression during early stages before zygotic gene activation (ZGA) is limited. Before activation of the embryonic genome, mRNA and proteins synthesized during oocyte growth and maturation contribute to early development. In this study, we compared the mRNA transcripts level among porcine immature, in vitro-matured and cleaved 2- to 4-cell stage embryos after in vitro fertilization to identify genes that show differential mRNA transcript levels during maturation and very early embryonic development. For the first strand cDNA synthesis, oligo (dT) primers were added to the total RNA isolated from each sample. Using annealing control primer (ACP)-based GeneFishing PCR, we detected tens of different genes showing differential mRNA transcript level (DRTL) and nine DRTL genes were identified to be KCRF, CAMSAP1, SMP1, FLJ20647, LOC132321, NADH1, NADH6, HERC3, and TEGT. Of 9 DRTL genes, TEGT showed higher mRNA transcript level at the immaturation stage, and mRNA transcript levels of the other 8 genes were increased after in vitro maturation. Therefore, we focused on TEGT (testis enhanced gene transcript), which is highly expressed in testis and also in oocytes before in vitro maturation. Differential mRNA transcripts pattern of CAMSAP1 and TEGT were confirmed using RT-PCR and real-time RT-PCR. Porcine TEGT (pTEGT) was cloned and sequenced to have an ORF of 714 bp nucleotides and to encode an integral membrane protein. When overexpressed in HEK293 cells, pTEGT suppressed apoptosis induced by etoposide. We found that pTEGT, but not TEGT-C (C-terminal deletion mutant), inhibited etoposide- and staurosporine-induced cell death. Next, we found that introduction of TEGT siRNA suppressed the anti-apoptotic effect of TEGT. Interestingly, expression of TEGT suppressed etoposide-induced ERK activation, suggesting that ERK phosphorylation is involved in the anti-apoptotic function of the gene. Several reports showed that apoptosis and MAP kinase signaling pathways play important roles in oocyte maturation and early embryo development. Therefore, the anti-apoptotic effect of TEGT was suggested to play a key role in the normal ooctye maturation and early embryo development. This work was supported by the Research Project on the Production of Bio-organs, Ministry of Agriculture and Forestry, Republic of Korea.
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